1. What is the Metric Screw Torque Formula?

The Metric Screw Torque Formula calculates the torque required to achieve proper tension in a screw or bolt. It is essential for ensuring mechanical integrity and preventing failures in assembled components.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

• \( T \) — Torque (Nm)
• \( K \) — Torque coefficient (dimensionless)
• \( F \) — Force (N)
• \( D \) — Diameter (m)

Explanation: The formula accounts for the relationship between applied force, screw diameter, and the friction coefficient to determine the required torque.

3. Importance of Torque Calculation

Details: Accurate torque calculation is crucial for proper fastener installation, preventing under-tightening (which can lead to loosening) and over-tightening (which can cause damage).

4. Using the Calculator

Tips: Enter torque coefficient (typically 0.2 for dry steel), force in Newtons, and diameter in meters. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical torque coefficient value?
A: For dry steel fasteners, K is typically around 0.2. Lubricated fasteners may have values around 0.15-0.18.

Q2: Why is proper torque important?
A: Proper torque ensures adequate clamping force, prevents joint failure, and maintains the integrity of mechanical assemblies.

Q3: How do I measure force accurately?
A: Force should be measured using calibrated equipment and applied perpendicular to the fastener axis for accurate results.

Q4: What factors affect torque coefficient?
A: Surface finish, lubrication, thread type, and material properties all influence the torque coefficient value.

Q5: Can this formula be used for all fastener types?
A: While the basic formula applies to most metric fasteners, specialized fasteners may require specific torque calculations.